Q.1:- The product of equivalent weight and valency of an element is equal to ?
- Vapour Density
- Specific Heat
- Atomic Weight
- Molecular Weight
Q.2:- Which one among the following is the heaviest ? [NDA Exam 2005]
- 1 mole of water molecules
- 1 mole of ammonia molecules
- 1 mole of sodium atoms
- 1 mole of hydrogen molecules
Q.3:- The charge on positron is equal to the charge on ?
- Proton
- Electron
- Alpha Particle
- Neutron
Q.4:- Which of the following elements does not exhibit natural radioactivity ? [SSC Exams 2014]
- Uranium
- Thorium
- Aluminium
- Polonium
Q.5:- A bond formed by the transfer of electrons between atoms of the elements is called ?
- Ionic Bond
- Covalent Bond
- Coordinate Bond
- Hydrogen Bond
Q.6:- Compound having tetrahedral structure is ?
- C2H4
- C2H2
- CH4
- None of the above
Q.7:- Oxidation number of N in NH4NO3 is ?
- -3
- +5
- -3 and +5
- +3 and -5
Q.8:- Which is not a Lewis Acid ?
- BF3
- AlCl3
- FeCl3
- NH3
Q.9:- The pH of water at 25 deg C is 7. When is heated to 100 deg C, the pH of water ? [NDA Exam 2004]
- Increases
- Decreases
- Remains same
- Decreases up to 50 Deg C and then increases
Q.10:- When the universal gas constant (R) is divided by Avogadro’s number (N), their ratio is called ?
- Planck’s constant
- Rydberg’s constant
- Boltzmann’s constant
- Van Der Waal’s constant
Q.11:- Efficiency of the catalyst depends on its ?
- Molecular state
- Number of free valencies
- Physical state
- Amount used
Q.12:- The calorific value of fat is ?
- Less than that of carbohydrates and protein
- Less than that of protein but more than carbohydrates
- Less than that of carbohydrate but more than that of protein
- More than that of carbohydrate and protein
Q.13:- The efficiency of a heat engine is maximum when ?
- Temperature of source is greater than that of sink
- Temperature of sink is greater than that of source
- Temperature difference of source and sink is minimum
- Temperature difference of source and sink is maximum
Q.14:- In which type of coal percentage of carbon is the highest ?
- Peat
- Lignite
- Bituminous
- Anthracite
Q.15:- The horizontal line in modern periodic table is called ?
- Period
- Group
- Metal
- None of the above
Q.16:- The elements in group zero are called ?
- Alkali Metals
- Transition Metals
- Inert Gases
- None of the above
Q.17:- The electron affinity of Chlorine is highest than that of Fluorine due to ?
- Its highest reactivity
- Bigger size
- Difference in their electronic configuration
- Smaller nuclear charge
Q.18:- The most electropositive amongst the alkaline earth metals is ?
- Beryllium
- Magnesium
- Barium
- Calcium
Q.19:- The most convenient way of expressing concentration is ?
- Normality
- Molarity
- Molality
- Mole Fraction
Q.20:- The best conductor of electricity is a 0.1 M solution of ?
- Acetic Acid
- Boric Acid
- Propionic Acid
- Sulphuric Acid
Q.21:- The depolarizer used in dry cell batteries is ?
- Manganese dioxide
- NH4Cl
- Sodium Tri-phosphide
- Potassium Hydroxide
Q.22:- The solution of rubber is an example of ?
- Lyophobic Acid
- Multi-Molecular Colloid
- Associated Colloid
- Macromolecular Colloid
Q.23:- Which one of the following contains maximum percentage of Carbon ? [SSC Exam 2014]
- Cast Iron
- Stainless Steel
- Wrought Iron
- High Speed Steel
Q.24:- Malachite is a mineral of ?
- Mg
- Cu
- Al
- Fe
Q.25:- The process of zone refining is used for ?
- Silicon
- Gallium
- Germanium
- All of the above